Island



W. R. HOWARD.

SYHINGE FOR INIECTING CEMENT IN TEETH.

APPLICATION FILED IuLY I4. IQII.

l ,@l 6. atented June 17, 1919.

33]' ltg/./Z

WILLIAM R. HOWARD, 0F NEWPORT, RHODE ISLAND.

SYRINGE FOR INJECTING CEMENT IN TEETH.

ioasie.

Specification of Letters Patent. Pajtntgdl Jun@ 17, 19190 Continuation of applications Serial No. 66,893, filed December 1 5, 1915, and Serial No. 109,430, led July 15, 1916. This application filed July 14, 1917. Serial No. 180,555.

To all whom may conce/m:

Be it known thatl I, WILLIAM R. HOWARD, a citizen of the United States, residing at Newport7 in the county of Newport and State of Rhode Island, have invented new and useful Improvements in Syringes for Injecting Cement in Teeth, of which the following is a specification.

This invention has relation to syringes and has for its primary object to provide an instrument of the class referred to which may be employed in dental work. In certain operations, such as crowning, root-filling and the like, it is necessary or desirable to insert plastic or fluid cement in a prepared cavity or socket in the tooth. Such an instrument should" be capable of sterilization, should be simple and inexpensive, and those parts which engage the tooth and the cement should be made of such cheap and inexpensive material that they may bediscarded after once being used. My invention has for its object, more specifically, to provide such an instrument.

On the drawings,-

Fgure 1 represents a side elevation of the syringe.

Fig. 2 represents an end elevation of the same.

Figs. 3 and 4 represent longitudinal sections, on a large scale, through the syringe, and show the plunger in two different positions.

Fig. 5 shows the end of the shank, with the barrel-holder removed.

Fig. 64 shows the barrel holder.

Fig. 7 illustrates the barrel removed from the holder and located to receive a charge of cement.

Fig. 8 shows another form of barrel.

As shown upon the drawing, the syringe comprises three main elements, to wit, a barrel which may be discarded after a single use, a holder therefor, and a plunger. The holder consists of a shank or handle portion, and a barrel-holding portion, which are separable, to permit the removal of the barrel; and the plunger consists of a rod or stem, and a piston which, if desired, may be separated from the stem. and discarded.

The shank or handle, as shown, consists of a metallic tube 10, which is curved for a portion of its length so that the axes of its extremities form an obtuse angle, and on the front end thereof is the barrel holder 11. Any suitable joint may be employed for temporarily or detachably connecting the holder and the shank. As shown, a bayonet joint may be used, the shank having pins 12 to extend into the opeirend angular slots 13 in the holder 11. The outer end of the holder is inwardly tapered as at 14. The barrel holder and the shank being of metal may be easily sterilized. The barrel consists preferably of celluloid or other like compound which easily may be molded or formed in shape and which is of such inexpensive construction that it may be discarded after a single use. The barrel is indicated as a whole at 15. It is substantially cylindrical in form with a tapering nozzle 16 which may be projected through the reduced end of the holder 14 so that the converging portion or extremity of the holder will engage a reduced portion of the 'barrel as shown in Figs. 3 and 4. The barrel may be positioned by iirst removing the holder 11 from the handle or shank 10, and introducing the barrel into the holder through the large open end thereof until the nozzle occupies the position shown in Figs. 3 and 4. The plunger comprises a piston 17 of some inexpensive material such as cardboard impregnated with a harmless compound inert in respect of the cement or other materials to be used in the syringe, such for example, as paraffin. The piston is illustrated as being substantially conical to eject as much cement as possible. The stem comprises a flexible member so that it may be moved longitudinally through the curved. portion of the shank. This flexible member may consist of a central wire 1S about which is a wire helix 19, and the end of the wire 18 may, if desired, extend far enough beyond the helix for insertion in the piston 17, as illustrated in Figs. 3 and 4. The end of the helix forms a shoulder 25 for engaging the piston and forcing it through the barrel. As illustrated, the opposite end of the flexible member is secured to a rod 2() which projects rearwardly beyond the shank 10 and is provided with a head 21 for its manipulation. By making the stem of metal, it may be sterilized coincidently with the sterilization of the shank and the holder. To assist in the manipulation of the syringe, a cross bar 22 is secured to the shank at a suitable point between the ends thereof so that the operator may use the syringe by placing the first two ngers of one hand 'against the cross bar and the thumb of his hand against the head of the stein, and thus, of suchinexpensive materialtliat it niay by pressure of his thuniby oreegtheustenr, used butponcemnd then discarded. The barthrougli the shank and the piston through rel is large enough to contain the required the barrel so as to eject from theLhafrrelsuch* body oticerneirt5laiicl` 'yet has the reduced material as may be contained therein. The-L nozale to deliver the cenient in a thin stream. 7o crossibar maytbe secured toithe shank ini Ithas a straight scraping edge (lwlieiriiranysuitable Way, being shown as provided seited iii the aperture 'Wliichlacilitatesv with a collar wvh'ich-'is brazedorl othertlie'l'iiSlTlOIOf theceinent This edge niay" Wise secured upon the shank." beperinanent; as shown inFig. 8, in which Itis ordinarily quite diticult, because oic the barrel has at its rear end a longitudinal 75, the .'sin'all, size'ot the,barrel,',to 'lill itj'with projection Ye,v the sides" j'. ot which .forni` cement,.particularly 1"sineewit' is circularin' straight scraping edges. .Inthits latter case, cross; :secti-oiix- -I' therefore' provideuneans thebairel maybe held' in one'handfwlien for so, bending orfresliaping.'the'endTofthe'' being 1ll`ed instead of"b`eingf inserted iinI barrel'faste/"ignariA a `.straight edgeagainst" the apertirel" f which the3knifenr'spatula inaybefscrapedf So,` far: 'as "the generic subjectniatter is f01-`llingttlfielinterior; of ,the barrel. .vljel concerned, this application is continuation' thisgend )the crossibar 22is providedivitlt' of vlny previous applications SeriaflfNo. aapelytuf 2-.Ths Said -prturei has 665893,'led`Deceinber 15;'1915, andSeria'l rectilinear or straight Walla Vand" a curved' No1 109,423.0,"ledulyl5@19rd "g5, Wall-;- these tivoj-ivallsapproximatingin .I {avngthus'explained the 'nature `of iny shape. the letter Being ferniedof cellu-f saidfnyention"and described Wayofinaklf" loid, lgelatin;or`V other like inateijial, andjing 'and using theisamc, although Withfo'iruh thereby being flexible', the, barrel inaybe. inf attempting to set forth all of the ltorins ins" serted inthe `apeiture24,as shoivniii' Figi' Whicliit ynu'iyloe niadej or'elflottlie nioiles ao: 7, andits end portion will contorni to. the( of itsiise',"` what I cl'a'iin'is'gf shape of the aperture lso as to afford a rec-i 1f AA syringe 'comprising -a holder `oft tubutilinear or straightedge c and thusfacilif'f lar torna,A "a"bairel proj,ectii'igv le'i'igthxvise" tate` the scraping 'of th'eycenient from "the" throughthe holder Vand"lia'vi'ng'a"iedueedf knife or. spatulan aintoLA the interior of 'the end'projecting tli'eie'fronto forni a nozgalegwg barrel# f j g" and a pluiiger locatediii the` liolde'rlf'and' ,Y Of course i't is not essential that the barmovable loiigitudinfally thereof lfor, eoperatlmi rel should be iliade ofcelluloid'r gelatin or ing Witlifsaidibarelfsaid holder 'h'a'vin'i'g` an like-,materials,- as-it may 'berinade ofpaper Ireduced end to engage thefbairelandhcld orother inexpensive material. it against longitudinal ,moveni'entf' 100 The juncture otgtlie nozzle with the cyliii- 21 A syringe co'rnpr'isinga 4'ti'ibilar holder; dricaiportionofrth barrel torinsashbuldier" formed ing-detachable sections7 a barrel Withf'vvhihtlieinwardly'tapered or reduced forniedof cheap niateiiialwadap'ted to'bep portion of the endet the; holder :may 'engageAh 'discarded after use and adapted to *berline to -limit theJ movement of the barrel 'viiif rev seited inponefsectionbf 'the holderrso asfztokio spectotthegholder as liereinbefore' stated. protrude ytherefro'1n,"thef projecting end ot t Inbperationg;ajbarrel jis inserted in the jtliebarrelbeing reduced to'fiinra noZle, l' aperture 24 ofthe cross, piece of the handle and aplunger in said holder,forlcoperatinii andis Illed iivitlirceinent, ,after \vliicli'2the"` with said barrel'. N 'i' barrel is located in the liolderll and the" holder inserted in place. h"Usually, the piston adapted ,to beY placed inftlie `holderu anddto is thrust into `the end @of tlie barrelbefore protrudetherethrough', the protruding fend,- the holder is positioned on the shank or l of the" 'b'arrelbeii'igreduced to foi-ina noz-JW handle;l Thereafter .the,operator, grasping `zle, and a plunger forcoperation Withlsaid the,ins t rument,in 'the Way previously de- -,barrel consisting of 'afstenf'aiid a Y i l i scribed5i places` the nozzle in tl ipatieits".4 tacliab'ly 'secured on `theend ofsaid stem, inouthfsoqasifto-direct the 'ceine it'into the" fsaid barrel and said "piston being respect-M socket --or cavitygwhich iliasfbeenpiepa'redf"tivelyforined oficheap material -iifliereby",U therefor,` and tliendrives ithetstein intothe they inay bediscardedafter use.A barrel, ij'oreiiigthf cement from the barrel,"l tjA'syringe comprisinga`ftubularshank,120i; intoitlie 'cavityior socket. l a barrelholderdetachablysecured -tliereto, i-IL`4 Shanksoiyliandles off. varying curvature a barrel adapted diorfi'nsertion into` saidff inay be providedyif desired, so as to aliord holderandhavinfifa:nozzleadapted tofpro-AV i itrude through-the v"end of said. holder;`V af i access tol cavitiesf in1 tlie diflere'ntly located. a

teeth. Dental cement haidens rapidly, and plunger vlocatedlin said "tubular shank," and 125: for this reason itispractically impossible to a piston adapted Vfort,engagement with said` i usegthesanie barreljtwicejnnlessit' is -inplunger,' said'pistonandfsaidi Vbaifielubei-ng i stantvly cleanvedrafter being used, and such,A .of inexpensivel niater'aLfWliereby ,theymVinay';4 cleaning is tedious ,and ,time-taking.t Ac- "'be disoardedafter a single use." u i' i cordingI torniy invention, I provide a barrel 5L Asyringei coiiiprisingfa'barrel holder7 13oi 3. A syringe comprising a holder, a barrel 'lie piston dei i a curved tubular shank detachably connected With said holder, a removable barrel contained Within said holder, and a plunger comprising a piston for coperation With said barrel and a flexible stem passing through said tubular shank for operating said piston.

6. A dental syringe comprising a holder, a removable barrel formed of flexible material adapted for insertion in said holder, and a member attachedto Said holder and provided with an aperture of Which one .Wall is straight or rectilinear, substantially for the purpose set forth.

7. A syringe comprising a holder, a barrel formed of cheap material adapted to be discarded after use and adapted to be ir.- serted in the holder and to protrude therefrom, the projecting end of the barrel being reduced to form a nozzle, and a plunger for coperation With said barrel.

8. A dental syringe comprising a body consisting of a longitudinally curved tubular shank and a barrel holder detachably secured thereto, a removable barrel insaid barrel holder, and a plunger for ejecting the contents of the barrel, said plunger having a flexible stem and a separable piston.

9. A dental syringe comprising a holder, a plunger, and a barrel formed of flexible material and having a Wall the edge oi' which is adapted to form a straight scraper.

l0. A dental syringe comprising a tubular body, a barrel oi' flexible material for insertion therein and normally circular in cross section, and a member secured to and projecting laterally from said body and having a D-shaped aperture in Which the barrel may be temporarily inserted for filling.

11. A dental syringe comprising a holder, a barrel formed of inexpensive material so as to be discarded after use, and adapted to be inserted in said holder, and a member formed to receive said barrel temporarily While said barrel is being filled.

In testimony whereof I have affixed my signature.

WILLIAM R. HOWARD.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

